package com.laiqilin.provider;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.config.GatewayProperties;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.support.NameUtils;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Component;
import org.springframework.web.reactive.config.ResourceHandlerRegistry;
import org.springframework.web.reactive.config.WebFluxConfigurer;
import springfox.documentation.swagger.web.SwaggerResource;
import springfox.documentation.swagger.web.SwaggerResourcesProvider;

import java.util.ArrayList;
import java.util.List;

@Component
public class SwaggerProvider implements SwaggerResourcesProvider, WebFluxConfigurer {

	public static final String SWAGGER2URL = "/v2/api-docs";

	@Lazy
	@Autowired
	private RouteLocator routeLocator; // 路由定位器

	@Autowired
	private GatewayProperties gatewayProperties; // 网关属性

	/**
	 * 获取Swagger资源列表
	 *
	 * @return Swagger资源列表
	 */
	@Override
	public List<SwaggerResource> get() {
		List<SwaggerResource> resourceList = new ArrayList<>();
		List<String> routes = new ArrayList<>();

		// 获取所有的路由ID
		routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));

		// 根据路由配置添加Swagger资源
		gatewayProperties.getRoutes().stream()
				.filter(routeDefinition -> routes.contains(routeDefinition.getId()))
				.forEach(routeDefinition -> routeDefinition.getPredicates().stream()
						.filter(predicateDefinition -> "Path".equalsIgnoreCase(predicateDefinition.getName()))
						.filter(predicateDefinition -> !"ruoyi-auth".equalsIgnoreCase(routeDefinition.getId()))
						.forEach(predicateDefinition -> resourceList
								.add(swaggerResource(routeDefinition.getId(), predicateDefinition.getArgs()
										.get(NameUtils.GENERATED_NAME_PREFIX + "0").replace("/**", SWAGGER2URL)))));
		return resourceList;
	}

	/**
	 * 创建Swagger资源
	 *
	 * @param name 路由名称
	 * @param location Swagger文档的路径
	 * @return SwaggerResource 对象
	 */
	private SwaggerResource swaggerResource(String name, String location) {
		SwaggerResource swaggerResource = new SwaggerResource();
		swaggerResource.setName(name);
		swaggerResource.setLocation(location);
		swaggerResource.setSwaggerVersion("2.0");
		return swaggerResource;
	}

	/**
	 * 添加Swagger UI的资源处理器
	 *
	 * @param registry 资源处理注册
	 */
	@Override
	public void addResourceHandlers(ResourceHandlerRegistry registry) {
		registry.addResourceHandler("/swagger-ui/**")
				.addResourceLocations("classpath:/META-INF/resources/webjars/springfox-swagger-ui/");
	}
}
